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VAE Image Processor

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VAE Image Processor

The VaeImageProcessor provides a unified API for StableDiffusionPipelines to prepare image inputs for VAE encoding and post-processing outputs once they’re decoded. This includes transformations such as resizing, normalization, and conversion between PIL Image, PyTorch, and NumPy arrays.

All pipelines with VaeImageProcessor accept PIL Image, PyTorch tensor, or NumPy arrays as image inputs and return outputs based on the output_type argument by the user. You can pass encoded image latents directly to the pipeline and return latents from the pipeline as a specific output with the output_type argument (for example output_type="latent"). This allows you to take the generated latents from one pipeline and pass it to another pipeline as input without leaving the latent space. It also makes it much easier to use multiple pipelines together by passing PyTorch tensors directly between different pipelines.

VaeImageProcessor

class diffusers.image_processor.VaeImageProcessor

( do_resize: bool = True vae_scale_factor: int = 8 vae_latent_channels: int = 4 resample: str = 'lanczos' do_normalize: bool = True do_binarize: bool = False do_convert_rgb: bool = False do_convert_grayscale: bool = False )

Parameters

do_resize (bool, optional, defaults to True) — Whether to downscale the image’s (height, width) dimensions to multiples of vae_scale_factor. Can accept height and width arguments from image_processor.VaeImageProcessor.preprocess() method.
vae_scale_factor (int, optional, defaults to 8) — VAE scale factor. If do_resize is True, the image is automatically resized to multiples of this factor.
resample (str, optional, defaults to lanczos) — Resampling filter to use when resizing the image.
do_normalize (bool, optional, defaults to True) — Whether to normalize the image to [-1,1].
do_binarize (bool, optional, defaults to False) — Whether to binarize the image to 0/1.
do_convert_rgb (bool, optional, defaults to be False) — Whether to convert the images to RGB format.
do_convert_grayscale (bool, optional, defaults to be False) — Whether to convert the images to grayscale format.

Image processor for VAE.

apply_overlay

( mask: Image init_image: Image image: Image crop_coords: typing.Optional[typing.Tuple[int, int, int, int]] = None ) → PIL.Image.Image

Parameters

mask (PIL.Image.Image) — The mask image that highlights regions to overlay.
init_image (PIL.Image.Image) — The original image to which the overlay is applied.
image (PIL.Image.Image) — The image to overlay onto the original.
crop_coords (Tuple[int, int, int, int], optional) — Coordinates to crop the image. If provided, the image will be cropped accordingly.

Returns

PIL.Image.Image

The final image with the overlay applied.

Applies an overlay of the mask and the inpainted image on the original image.

binarize

( image: Image ) → PIL.Image.Image

Parameters

image (PIL.Image.Image) — The image input, should be a PIL image.

Returns

PIL.Image.Image

The binarized image. Values less than 0.5 are set to 0, values greater than 0.5 are set to 1.

Create a mask.

blur

( image: Image blur_factor: int = 4 ) → PIL.Image.Image

Parameters

image (PIL.Image.Image) — The PIL image to convert to grayscale.

Returns

PIL.Image.Image

The grayscale-converted PIL image.

Applies Gaussian blur to an image.

convert_to_grayscale

( image: Image ) → PIL.Image.Image

Parameters

image (PIL.Image.Image) — The input image to convert.

Returns

PIL.Image.Image

The image converted to grayscale.

Converts a given PIL image to grayscale.

convert_to_rgb

( image: Image ) → PIL.Image.Image

Parameters

image (PIL.Image.Image) — The PIL image to convert to RGB.

Returns

PIL.Image.Image

The RGB-converted PIL image.

Converts a PIL image to RGB format.

denormalize

( images: typing.Union[numpy.ndarray, torch.Tensor] ) → np.ndarray or torch.Tensor

Parameters

images (np.ndarray or torch.Tensor) — The image array to denormalize.

Returns

np.ndarray or torch.Tensor

The denormalized image array.

Denormalize an image array to [0,1].

get_crop_region

( mask_image: Image width: int height: int pad = 0 ) → tuple

Parameters

mask_image (PIL.Image.Image) — Mask image.
width (int) — Width of the image to be processed.
height (int) — Height of the image to be processed.
pad (int, optional) — Padding to be added to the crop region. Defaults to 0.

Returns

tuple

(x1, y1, x2, y2) represent a rectangular region that contains all masked ares in an image and matches the original aspect ratio.

Finds a rectangular region that contains all masked ares in an image, and expands region to match the aspect ratio of the original image; for example, if user drew mask in a 128x32 region, and the dimensions for processing are 512x512, the region will be expanded to 128x128.

get_default_height_width

( image: typing.Union[PIL.Image.Image, numpy.ndarray, torch.Tensor] height: typing.Optional[int] = None width: typing.Optional[int] = None ) → Tuple[int, int]

Parameters

image (Union[PIL.Image.Image, np.ndarray, torch.Tensor]) — The image input, which can be a PIL image, NumPy array, or PyTorch tensor. If it is a NumPy array, it should have shape [batch, height, width] or [batch, height, width, channels]. If it is a PyTorch tensor, it should have shape [batch, channels, height, width].
height (Optional[int], optional, defaults to None) — The height of the preprocessed image. If None, the height of the image input will be used.
width (Optional[int], optional, defaults to None) — The width of the preprocessed image. If None, the width of the image input will be used.

Returns

Tuple[int, int]

A tuple containing the height and width, both resized to the nearest integer multiple of vae_scale_factor.

Returns the height and width of the image, downscaled to the next integer multiple of vae_scale_factor.

normalize

( images: typing.Union[numpy.ndarray, torch.Tensor] ) → np.ndarray or torch.Tensor

Parameters

images (np.ndarray or torch.Tensor) — The image array to normalize.

Returns

np.ndarray or torch.Tensor

The normalized image array.

Normalize an image array to [-1,1].

numpy_to_pil

( images: ndarray ) → List[PIL.Image.Image]

Parameters

images (np.ndarray) — The image array to convert to PIL format.

Returns

List[PIL.Image.Image]

A list of PIL images.

Convert a numpy image or a batch of images to a PIL image.

numpy_to_pt

( images: ndarray ) → torch.Tensor

Parameters

images (np.ndarray) — The NumPy image array to convert to PyTorch format.

Returns

torch.Tensor

A PyTorch tensor representation of the images.

Convert a NumPy image to a PyTorch tensor.

pil_to_numpy

( images: typing.Union[typing.List[PIL.Image.Image], PIL.Image.Image] ) → np.ndarray

Parameters

images (PIL.Image.Image or List[PIL.Image.Image]) — The PIL image or list of images to convert to NumPy format.

Returns

np.ndarray

A NumPy array representation of the images.

Convert a PIL image or a list of PIL images to NumPy arrays.

postprocess

( image: Tensor output_type: str = 'pil' do_denormalize: typing.Optional[typing.List[bool]] = None ) → PIL.Image.Image, np.ndarray or torch.Tensor

Parameters

image (torch.Tensor) — The image input, should be a pytorch tensor with shape B x C x H x W.
output_type (str, optional, defaults to pil) — The output type of the image, can be one of pil, np, pt, latent.
do_denormalize (List[bool], optional, defaults to None) — Whether to denormalize the image to [0,1]. If None, will use the value of do_normalize in the VaeImageProcessor config.

Returns

PIL.Image.Image, np.ndarray or torch.Tensor

The postprocessed image.

Postprocess the image output from tensor to output_type.

preprocess

( image: typing.Union[PIL.Image.Image, numpy.ndarray, torch.Tensor, typing.List[PIL.Image.Image], typing.List[numpy.ndarray], typing.List[torch.Tensor]] height: typing.Optional[int] = None width: typing.Optional[int] = None resize_mode: str = 'default' crops_coords: typing.Optional[typing.Tuple[int, int, int, int]] = None ) → torch.Tensor

Parameters

image (PipelineImageInput) — The image input, accepted formats are PIL images, NumPy arrays, PyTorch tensors; Also accept list of supported formats.
height (int, optional) — The height in preprocessed image. If None, will use the get_default_height_width() to get default height.
width (int, optional) — The width in preprocessed. If None, will use get_default_height_width()` to get the default width.
resize_mode (str, optional, defaults to default) — The resize mode, can be one of default or fill. If default, will resize the image to fit within the specified width and height, and it may not maintaining the original aspect ratio. If fill, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, filling empty with data from image. If crop, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, cropping the excess. Note that resize_mode fill and crop are only supported for PIL image input.
crops_coords (List[Tuple[int, int, int, int]], optional, defaults to None) — The crop coordinates for each image in the batch. If None, will not crop the image.

Returns

torch.Tensor

The preprocessed image.

Preprocess the image input.

pt_to_numpy

( images: Tensor ) → np.ndarray

Parameters

images (torch.Tensor) — The PyTorch tensor to convert to NumPy format.

Returns

np.ndarray

A NumPy array representation of the images.

Convert a PyTorch tensor to a NumPy image.

resize

( image: typing.Union[PIL.Image.Image, numpy.ndarray, torch.Tensor] height: int width: int resize_mode: str = 'default' ) → PIL.Image.Image, np.ndarray or torch.Tensor

Parameters

image (PIL.Image.Image, np.ndarray or torch.Tensor) — The image input, can be a PIL image, numpy array or pytorch tensor.
height (int) — The height to resize to.
width (int) — The width to resize to.
resize_mode (str, optional, defaults to default) — The resize mode to use, can be one of default or fill. If default, will resize the image to fit within the specified width and height, and it may not maintaining the original aspect ratio. If fill, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, filling empty with data from image. If crop, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, cropping the excess. Note that resize_mode fill and crop are only supported for PIL image input.

Returns

PIL.Image.Image, np.ndarray or torch.Tensor

The resized image.

Resize image.

VaeImageProcessorLDM3D

The VaeImageProcessorLDM3D accepts RGB and depth inputs and returns RGB and depth outputs.

class diffusers.image_processor.VaeImageProcessorLDM3D

( do_resize: bool = True vae_scale_factor: int = 8 resample: str = 'lanczos' do_normalize: bool = True )

Parameters

do_resize (bool, optional, defaults to True) — Whether to downscale the image’s (height, width) dimensions to multiples of vae_scale_factor.
vae_scale_factor (int, optional, defaults to 8) — VAE scale factor. If do_resize is True, the image is automatically resized to multiples of this factor.
resample (str, optional, defaults to lanczos) — Resampling filter to use when resizing the image.
do_normalize (bool, optional, defaults to True) — Whether to normalize the image to [-1,1].

Image processor for VAE LDM3D.

depth_pil_to_numpy

( images: typing.Union[typing.List[PIL.Image.Image], PIL.Image.Image] ) → np.ndarray

Parameters

images (Union[List[PIL.Image.Image], PIL.Image.Image]) — The input image or list of images to be converted.

Returns

np.ndarray

A NumPy array of the converted images.

Convert a PIL image or a list of PIL images to NumPy arrays.

numpy_to_depth

( images: ndarray ) → List[PIL.Image.Image]

Parameters

images (np.ndarray) — The input NumPy array of depth images, which can be a single image or a batch.

Returns

List[PIL.Image.Image]

A list of PIL images converted from the input NumPy depth images.

Convert a NumPy depth image or a batch of images to a list of PIL images.

numpy_to_pil

( images: ndarray ) → List[PIL.Image.Image]

Parameters

images (np.ndarray) — The input NumPy array of images, which can be a single image or a batch.

Returns

List[PIL.Image.Image]

A list of PIL images converted from the input NumPy array.

Convert a NumPy image or a batch of images to a list of PIL images.

preprocess

( rgb: typing.Union[torch.Tensor, PIL.Image.Image, numpy.ndarray] depth: typing.Union[torch.Tensor, PIL.Image.Image, numpy.ndarray] height: typing.Optional[int] = None width: typing.Optional[int] = None target_res: typing.Optional[int] = None ) → Tuple[torch.Tensor, torch.Tensor]

Parameters

rgb (Union[torch.Tensor, PIL.Image.Image, np.ndarray]) — The RGB input image, which can be a single image or a batch.
depth (Union[torch.Tensor, PIL.Image.Image, np.ndarray]) — The depth input image, which can be a single image or a batch.
height (Optional[int], optional, defaults to None) — The desired height of the processed image. If None, defaults to the height of the input image.
width (Optional[int], optional, defaults to None) — The desired width of the processed image. If None, defaults to the width of the input image.
target_res (Optional[int], optional, defaults to None) — Target resolution for resizing the images. If specified, overrides height and width.

Returns

Tuple[torch.Tensor, torch.Tensor]

A tuple containing the processed RGB and depth images as PyTorch tensors.

Preprocess the image input. Accepted formats are PIL images, NumPy arrays, or PyTorch tensors.

rgblike_to_depthmap

( image: typing.Union[numpy.ndarray, torch.Tensor] ) → Union[np.ndarray, torch.Tensor]

Parameters

image (Union[np.ndarray, torch.Tensor]) — The RGB-like depth image to convert.

Returns

Union[np.ndarray, torch.Tensor]

The corresponding depth map.

Convert an RGB-like depth image to a depth map.

PixArtImageProcessor

class diffusers.image_processor.PixArtImageProcessor

( do_resize: bool = True vae_scale_factor: int = 8 resample: str = 'lanczos' do_normalize: bool = True do_binarize: bool = False do_convert_grayscale: bool = False )

Parameters

do_resize (bool, optional, defaults to True) — Whether to downscale the image’s (height, width) dimensions to multiples of vae_scale_factor. Can accept height and width arguments from image_processor.VaeImageProcessor.preprocess() method.
vae_scale_factor (int, optional, defaults to 8) — VAE scale factor. If do_resize is True, the image is automatically resized to multiples of this factor.
resample (str, optional, defaults to lanczos) — Resampling filter to use when resizing the image.
do_normalize (bool, optional, defaults to True) — Whether to normalize the image to [-1,1].
do_binarize (bool, optional, defaults to False) — Whether to binarize the image to 0/1.
do_convert_rgb (bool, optional, defaults to be False) — Whether to convert the images to RGB format.
do_convert_grayscale (bool, optional, defaults to be False) — Whether to convert the images to grayscale format.

Image processor for PixArt image resize and crop.

classify_height_width_bin

( height: int width: int ratios: dict ) → Tuple[int, int]

Parameters

height (int) — The height of the image.
width (int) — The width of the image.
ratios (dict) — A dictionary where keys are aspect ratios and values are tuples of (height, width).

Returns

Tuple[int, int]

The closest binned height and width.

Returns the binned height and width based on the aspect ratio.

resize_and_crop_tensor

( samples: Tensor new_width: int new_height: int ) → torch.Tensor

Parameters

samples (torch.Tensor) — A tensor of shape (N, C, H, W) where N is the batch size, C is the number of channels, H is the height, and W is the width.
new_width (int) — The desired width of the output images.
new_height (int) — The desired height of the output images.

Returns

torch.Tensor

A tensor containing the resized and cropped images.

Resizes and crops a tensor of images to the specified dimensions.

IPAdapterMaskProcessor

class diffusers.image_processor.IPAdapterMaskProcessor

( do_resize: bool = True vae_scale_factor: int = 8 resample: str = 'lanczos' do_normalize: bool = False do_binarize: bool = True do_convert_grayscale: bool = True )

Parameters

do_resize (bool, optional, defaults to True) — Whether to downscale the image’s (height, width) dimensions to multiples of vae_scale_factor.
vae_scale_factor (int, optional, defaults to 8) — VAE scale factor. If do_resize is True, the image is automatically resized to multiples of this factor.
resample (str, optional, defaults to lanczos) — Resampling filter to use when resizing the image.
do_normalize (bool, optional, defaults to False) — Whether to normalize the image to [-1,1].
do_binarize (bool, optional, defaults to True) — Whether to binarize the image to 0/1.
do_convert_grayscale (bool, optional, defaults to be True) — Whether to convert the images to grayscale format.

Image processor for IP Adapter image masks.

downsample

( mask: Tensor batch_size: int num_queries: int value_embed_dim: int ) → torch.Tensor

Parameters

mask (torch.Tensor) — The input mask tensor generated with IPAdapterMaskProcessor.preprocess().
batch_size (int) — The batch size.
num_queries (int) — The number of queries.
value_embed_dim (int) — The dimensionality of the value embeddings.

Returns

torch.Tensor

The downsampled mask tensor.

Downsamples the provided mask tensor to match the expected dimensions for scaled dot-product attention. If the aspect ratio of the mask does not match the aspect ratio of the output image, a warning is issued.

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